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Page 19: Please note the HDMI audio output only supports AC3, DTS and 2-channel-LPCM formats. (AC3 and DTS require the use of an external decoder for decoding.)

If you have a surround receiver supporting AC3/DTS decoding (most surround receivers produced after 2000 do), "mplayer -ac hwdts,hwac3, -ao alsa" using a coaxial or optical cable connected to SPDIF should result in 5.1 output on the receiver.

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If you have a surround receiver supporting AC3/DTS decoding (most surround receivers produced after 2000 do), "mplayer -ac hwdts,hwac3, -ao alsa" using a coaxial or optical cable connected to SPDIF should result in 5.1 output on the receiver.

I looked at the settings and it shows still stereo under lucid sound settings. I had the same with the Intel HD graphics and now I have still stereo shown with the ATI card.
I did re install in between.

Is this normal? I will have to look and test if this is just a display issue.

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You might want to play with gl sub-options as well. Maybe try something like mplayer -vo gl:yuv=2:rectangle=1..

The first option should reduce CPU load by doing YUV-RGB conversion on the GPU rather than the CPU, second option should reduce memory usage by using non-power-of-two textures. Default for both of the sub-options is 0.

Comment

You might want to play with gl sub-options as well. Maybe try something like mplayer -vo gl:yuv=2:rectangle=1..

The first option should reduce CPU load by doing YUV-RGB conversion on the GPU rather than the CPU, second option should reduce memory usage by using non-power-of-two textures. Default for both of the sub-options is 0.

Thanks Bridman for the info.

For everyone info, SMplayer provides a good abstraction layer on top on Mplayer and also provides direct configuration of gl(yuv).

FYI here is my SMplayer video config:

Enable post-processing by default (quality set to 6 by default) (not set)